fail vs drop dead

fail and drop dead both are verbs.

Word	Noun	Adjective	Verb	Adverb
fail	No	No	Yes	No
drop dead	No	No	Yes	No

fail (verb)	drop dead (verb)
stop operating or functioning	pass from physical life and lose all bodily attributes and functions necessary to sustain life
deteriorate
prove insufficient
disappoint, prove undependable to; abandon, forsake
become bankrupt or insolvent; fail financially and close
be unsuccessful
fail to get a passing grade
fail to do something; leave something undone
judge unacceptable
be unable
fall short in what is expected